Barrier / atomic operations on multiprocessors.

[Brian Dessent]

Ray Whitmer wrote:

> Is there a generic way to access efficient platform-appropriate memory
> barriers (also compare and swap) in any arbitrary C or C++ program
> compiled under gcc (not just a compiler ordering directive, but
> extending to hardware guarantees)?
> 
> If it is documented somewhere, I apologize.

Well, there's <http://gcc.gnu.org/onlinedocs/gcc/Atomic-Builtins.html>.

Brian